I'm rather fond of Southcoast: http://southcoastukes.com/categories.htm
I use both strings by mail, and strings and beyond. Both have shipped quickly without any issues. I just ordered more strings to try from strings and beyond with their free shipping promo this weekend.
I'm rather fond of Southcoast: http://southcoastukes.com/categories.htm
And if you like fluorocarbon strings, don’t forget about Ken Middleton’s Living Water Strings, which have to be ordered via mail (there may be a shop or two with some in stock, but that is not common).
I've used primarily Strings By Mail ($3.99 flat rate shipping any size order in USA) for their wider selection and Strings and Beyond for their free shipping (often they have a special of no minimum order amount, as opposed to the $35 minimum order which is their regular threshold)
Still now, some years later, it seems that Uke Republic is still the only US dealer for Living Water strings:
http://cargo.ukerepublic.com/product/living-water-ukulele-fluorocarbon-strings
A few times I bought strings from eBay simply because they were not available anywhere else for some odd sets (usually due to being out of productions, like ORCAS black fluoro strings), but that source seems to have dried up over the past year.
Still now, some years later, it seems that Uke Republic is still the only US dealer for Living Water strings:
http://cargo.ukerepublic.com/product/living-water-ukulele-fluorocarbon-strings
Uke Republic carries Living Waters strings. I recently received some from them, and they came pretty quick. I ordered two sets of concert strings and received one set. The other is on backorder.And if you like fluorocarbon strings, don’t forget about Ken Middleton’s Living Water Strings, which have to be ordered via mail (there may be a shop or two with some in stock, but that is not common).
I order them straight from Ken. Shipping is £3 (~$4) for as many sets as you want and the cost for the sets is the same.